Update SDK to 2026-01-23

[damaz91]

This pull request introduces major improvements to the model generation workflow, schema preprocessing, and project structure for the UCP Python SDK. The most significant changes include the addition of a schema preprocessing script to resolve compatibility issues, updates to the model generation script to use preprocessed schemas, a refactor of capability and discovery profile models for clarity and separation, and enhanced formatting and linting for generated code.

Schema Preprocessing and Model Generation:

• Added a new preprocess_schemas.py script to preprocess JSON schemas, resolving internal references and removing problematic definitions to ensure compatibility with datamodel-code-generator. The generate_models.sh script is updated to invoke this preprocessing step and to format/lint generated models using Ruff. [1] [2] [3] [4]

Model and Schema Refactoring:

• Refactored capability and discovery profile models for better separation and clarity. The new structure introduces clear distinctions between platform, business, and response schemas for both capabilities and payment handlers, and updates discovery profile models to use these new schema types. [1] [2] [3] [4]

Formatting and Linting Improvements:

• Removed Ruff configuration from pyproject.toml and now generate a dedicated ruff.toml in the models directory for more lenient linting of auto-generated code. The model generation script now applies formatting and lint fixes automatically. [1] [2] [3] [4]

Documentation and Setup Updates:

• Updated the README.md to clarify repository cloning instructions and document the need to clone the main UCP repository for schema regeneration. [1] [2]

Cleanup and Deprecation:

• Removed the legacy _internal.py models file, as its functionality has been replaced by the new schema-based model structure.